<template>
    <div class="login-container">
        <!-- 导航栏 -->
        <van-nav-bar class="page-nav-bar" title="登录" />
        <!-- /导航栏 -->

        <!-- 登录表单 -->
        <!--
          表单验证：
            1、给 van-field 组件配置 rules 验证规则
              参考文档：https://youzan.github.io/vant/#/zh-CN/form#rule-shu-ju-jie-gou
            2、当表单提交的时候会自动触发表单验证
               如果验证通过，会触发 submit 事件
               如果验证失败，不会触发 submit
         -->
        <van-form  ref="loginForm"  @submit="onSubmit">
            <van-field
                v-model="user.mobile"
                name="mobile"
                placeholder="请输入手机号"
                :rules="userFormRules.mobile"
                type="number"
                maxlength="11"
            >
                <i slot="left-icon" class="toutiao toutiao-shouji"></i>
            </van-field>
            <van-field
                v-model="user.code"
                placeholder="请输入验证码"
            >
                <i class="icon icon-mima" slot="left-icon"></i>
                <van-count-down
                    v-if="isCountDownShow"
                    slot="button"
                    :time="1000 * 5"
                    format="ss s"
                    @finish="isCountDownShow = false"
                />
                <van-button
                    v-else
                    slot="button"
                    size="small"
                    type="primary"
                    round
                    @click="onSmsCode"
                    native-type="button"
                >发送验证码</van-button>
            </van-field>
            <div class="login-btn-wrap">
                <van-button class="login-btn" block type="info" >
                    登录
                </van-button>
            </div>
        </van-form>
        <!-- /登录表单 -->
    </div>
</template>

<script>
import { getSmsCode, login } from '@/api/user'

export default {
  name: 'LoginIndex',
  components: {},
  props: {},
  data () {
    return {
      user: {
        mobile: '13888888888', // 手机号
        code: '246810' // 验证码
      },
      userFormRules: {
        mobile: [{
          required: true,
          message: '手机号不能为空'
        }, {
          pattern: /^1[3|5|7|8]\d{9}$/,
          message: '手机号格式错误'
        }],
        code: [{
          required: true,
          message: '验证码不能为空'
        }, {
          pattern: /^\d{6}$/,
          message: '验证码格式错误'
        }]
      },
      isCountDownShow: false
    }
  },
  computed: {},
  watch: {},
  created () {},
  mounted () {},
  methods: {
    async onSubmit () {
      // 1. 获取表单数据
      const user = this.user

      // TODO: 2. 表单验证

      // 3. 提交表单请求登录
      this.$toast.loading({
        message: '登录中...',
        forbidClick: true, // 禁用背景点击
        duration: 0 // 持续时间，默认 2000，0 表示持续展示不关闭
      })

      try {
        const res = await login(user)
        this.$store.commit('setUser', res.data.data)
        console.log('登录成功', res)
        this.$toast.success('登录成功')
        // 登录成功，跳转回原来页面
        // back 的方式不严谨，后面讲功能优化的时候再说
        this.$router.back()
      } catch (err) {
        if (err.response.status === 400) {
          this.$toast.fail('手机号或验证码错误')
        } else {
          this.$toast.fail('登录失败，请稍后重试')
        }
      }

      // 4. 根据请求响应结果处理后续操作
    },

    // Change the type to button to prevent default submit behavior
    async onSmsCode () {
      // 1. 校验手机号
      try {
        // The name of the verification item must be mobile
        await this.$refs.loginForm.validate('mobile')
      } catch (err) {
        return console.log('验证失败', err)
      }

      // 2. 验证通过，显示倒计时
      this.isCountDownShow = true

      // 3. 请求发送验证码
      try {
        await getSmsCode(this.user.mobile)
        this.$toast('发送成功')
      } catch (err) {
        // 发送失败，关闭倒计时
        this.isCountDownShow = false
        if (err.response.status === 429) {
          this.$toast('发送太频繁了，请稍后重试')
        } else {
          this.$toast('发送失败，请稍后重试')
        }
      }
    }
  }
}
</script>

<style scoped lang="less">
.login-container {
    .toutiao {
        font-size: 37px;
    }

    .send-sms-btn {
        width: 152px;
        height: 46px;
        line-height: 46px;
        background-color: #ededed;
        font-size: 22px;
        color: #666;
    }

    .login-btn-wrap {
        padding: 53px 33px;
        .login-btn {
            background-color: #6db4fb;
            border: none;
        }
    }
}
</style>
